Printing telegraph selector



y 9 w. J. ZENNER 2,595,745

PRINTING TELEGRAPH SELECTOR Filed March 19, 1949 INVENTOR WALTER J. 25 mm ATTORNEY FIG. i

Patented May 6, 1952 PRINTING TELEGRAPH SELECTOR Walter J. Zenner, Des Plaines, Ill., assignor to Teletype Corporation, Chicago, 111., a corporation of Delaware Application March 19, 1949, Serial No. 82,391

27 Claims.

The present invention pertains to printing telegraph apparatus and more particularly to high speed selector mechanisms for controlling the operation of such apparatus.

The primary object of the invention is to provide a highly sensitive selector mechanism capable of operating at high speeds to control effectively the setting of mechanical elements.

Another object of the invention is to accelerate selecting operations by providing the selector magnet with a lightweight armature cooperable with a minimum number of sensing elements.

A further object of the invention is to provide a selector mechanism having a single sensing element cooperable with the armature of the selector magnet to control the selective functioning of a plurality of selectors.

Another object of the invention is to provide a pair of interlocking means associated with the selector magnet armature to lock said armature in marking or spacing position during the respective signal impulse interval under the control of a pair of control cams.

Briefly, the selector mechanism according to the present invention comprises a group of signal magnet controlled members which are successively and selectively operated positively in accordance with the nature of the received signal impulses. The selectable members are effective under predetermined selecting conditions to operate a corresponding group of slidable actuators, which function through oscillatable instrumentalities to condition interponents for cooperation selectively with a constantly operating pair of scissor bars to which motion is imparted by a toggle drive means.

A better understanding of the invention may be had by reference to the following detailed description when considered in conjunction with the accompanying drawing, wherein,

Fig. 1 is a perspective representation of the selector mechanism according to the present invention;

Fig. 2 is a fragmental rear perspective view of a portion of the selector mechanism shown in Fig. 1;

Fig. 3 is a cross sectional view of the selector mechanism through the selector cam shaft; and

Fig. 4 is a timing chart showing the relative time of operation of the various cams in the apparatus, and illustrating the time in which the various functional operations are performed.

Referring now to the drawings wherein like reference characters designate the same parts throughout the several views, particular reference being had to Fig. l, the numeric II designates the selector magnet which is considered as suitably and appropriately supported by means (not shown) in the telegraph printer apparatus. Associated with the selector magnet I I is an armature member I2 pivotally mounted on a pivot shaft I3. Armature member I2 is normally biased counterclockwise (as viewed in Fig. 1) by a spring I4.

An important feature of the present invention resides in the provision of a very lightweight armature, thus reducing to a minimum the load on the selector magnet II. In the present embodiment, the armature I2, in order to effect selective operations need only cooperate with a single sensing lever or sensor I5. However, in one form of the invention, a pair of sensing levers or sensors I5 and I6 provide an interlocking means to lock the armature I2 in marking or spacing position during the respective signal impulse interval under the control of a pair of control cams I1 and I8. Thus, the mass of the armature is reduced, since it need not span all of the selector levers, as will presently appear, but only the sensor I5 or the sensing levers I5 and I6, as the case may be.

Having reference to Fig. 3, it is observed that the sensing levers or sensors I5 and I6 are provided with oppositely disposed confronting shoulder portions I9 and 2|, respectively, which cooperate with the narrow extremity of the armature I2. When the armature I 2 is in the marking position (solid line position in Fig. 3), the sensor I5 will be urged by its spring 22, when permitted by its cam IT, to position table portion 23 underneath the outer end portion of armature I2 so that the armature I2 becomes locked between the shouldered portion 2I of lever I6 and table portion 23 of lever I5. On the other hand, when the armature I2 is in the spacing position (dotted line position in Fig. 3), the sensor I6 will be urged by its spring 24, when permitted by its cam I8, to position its surface 25 above the outer end portion of armature I2 so that the armature I2 becomes locked between the shouldered portion I9 of sensor I5 and surface 25 of sensor I6.

The sensor control cams l1 and I8 are carried on a sleeve 26 mounted on a shaft 21. Also carried on the sleeve 26 are a start cam 28, five selector cams 3I to 35, inclusive, and a bail operating cam 36. A stop disc 3! is also carried on the sleeve 26. The aforementioned cams and stop disc are angularly arranged on the sleeve 26 in a manner to effect, in predetermined timed relation, the operation of the follower elements or selectors ll to 45 in response to received code signal impulses. The cam notches E33 on the selector cams 3[ to 35 are arranged in a helical manner, as exemplified by the diagram shown in Fig. 4, and the cam sleeve 25 is rotated at a speed commensurate with the speed of code impulsing.

In accordance with well known practice, the normal condition of the signal line 51 is a marking condition; that is, current on the line. In this condition, the selector magnet l l is normally energized and its lightweight armature l2 is pulled up, in opposition to spring M, as indicated in Fig. 1 with its extremity engaging the shoulder 21 of the sensing lever l6. Cooperating with the lever I6 is a laterally extending portion 43 of the vertical arm 49 of a stop bail i mounted pivotally on an appropriately positioned shaft 52. The horizontal arm 53 of the bail 5! is provided at its extremity with a suitably conformed stop portion 54 which cooperates with the stop projection 55 on the stop disc 31. The extremity 56 of the vertical arm 49 of bail 5| confronts a notch 51 formed in the disc 28 in the stop position of the cam sleeve 26 and the stop portion 54 engages the stop projection 55.

The stop position of the cam sleeve 26, the control cam [1 presents a high portion to its cam follower 58 on the sensing lever I5 so as to hold the shoulder [9 out of the path of the extremity of the armature 12. At the same time, the control cam [8 presents a low portion thereof to the cam follower 59 on its associated sensing lever l6. In this relative position of cams ll and IS the levers l5 and I6 are held in the position shown in Fig. 3 during the stop interval.

Now, in response to a start signal impulse, which is of spacing (or no current) nature, the selector magnet II will become de-energized, and the spring M will urge the armature l2 away from the magnet core to the dotted position shown in Fig. 3. In this condition, the extremity of armature I2 is disengaged from shoulder 2| thus permitting the lever 16 to respond to the pull of its spring 24 due to the presence of the cam notch SI of cam I! in front of the follower 59 of lever l5.

Sensing lever It will thus rotate a predetermined amount in a clockwise direction (as viewed in Figs. 1 and 3), thereby permitting the bail 5i to alsorotate a corresponding amount in the same direction due to the fact that the arm 49 can fall into the notch 5! of disc 28 and the portion 48 can follow the movement of the lever I6. The hole is provided to eliminate interference between the leading end of lever l6 and the armature when the armature I2 is locked by shoulder 23. The bail 5| is thus rotated clockwise (Fig. 1) a sufficient amount to release the end 54 from the stop projection to permit the cam sleeve 26 to rotate. The disc 28 will, after a predetermined amount of rotation sufficient to permit the stop lug 55 to escape end 54, thereafter function to hold the bail 5| in its counterclockwise position to prevent vibration thereof during the signaling period and until the stop period is reached whereat the lever l6 will again become blocked by the armature I2, as hereinbefore described, and be effective to hold the bail 5! in its counterclockwise position to stop the rotation of disc 3'! after the completion of one cycle of rotation.

Having reference to Fig. 3, it is observed that the cams I1 and I8 are provided with cam projections 62 to cause the levers l5 and It to vibrate in unison with code impulsing. The apices 62 engage the followers 58 and 59 substantially during the transition time between code signal impulses. Then when the armature I2 assumes its attracted or retracted position a hollow 63 of the cams II and I8 is presented to the cam followers 58 and 59 to permit clockwise movement of sensing levers l5 and It, in the manner previously described. Briefly, for a marking or current condition the sensing lever I6 is blocked, and the armature I2 is locked between the shoulder 2| and the table 23. For a spacing or no current condition the sensing lever I5 is blocked, and the armature i2 is locked between the shoulder [9 and the surface 25.

The sensing lever 15 is provided at its upper end with a pair of arms 54 projecting from each side thereof sufficiently to span the upper ends of the selector levers or follower elements 4! to 45, inclusive, which are supported pivotally on a pivot shaft 65. Suitable spacer sleeves 55 are provided to properly space the follower elements 4| to 45, which are normally biased clockwise (as viewed in Fig. 1) by individual springs 6! to tend to cooperate with the selector cams 3! to 35 associated therewith through the follower portions 68.

Each of the follower elements '5! to 45 is conformed like the follower element 42 shown in Fig. 1. The remaining follower elements have been broken away for clarity. The followers 4| to 45, exemplified by follower 42, are each provided with a bearing surface 69 by means of which they normally tend to rest against the arms 54. The followers 4| to 35 are each provided with a jaw-like extremity and into the opening H of which one end of a slidable actuator or interponent 72 is adapted to operate. The jaw or opening H is provided with a stepped portion 13 for a purpose hereinafter described. The other end of the interponent l2 rests upon a support M .fixed to the main apparatus and is provided with a depending portion 15. A spring 16 normally urges the interponent i2 rightwardly (as viewed in Fig. 1) so that the depending portion 15 normally bears against the support M.

Cooperatively associated with the interponents E2 is a corresponding group of transfer instrumentalities or members 8| to 85, inclusive, mounted pivotally on a pivot shaft 86. Suitable spacing sleeves 8? maintain the members 8! to in proper space relation. Each member 8| to 85 is provided with a pair of vertically directed arms 88 and 89. Arm 89 cooperates with the associated interponent 12, while the arm 88 coacts with the depending stem portion 90 of one of a corresponding group of Y-lever 9! to 95, inclusive, mounted pivotally on a pivot shaft 96. A spring 91 is extended between the stem 90 of a Y-lever 9! to 95 and a spring post 98 integral with the arm 88 of its associated member 8| to 85. In the drawings (Fig. 1), the spring 9! is shown extended between Y-lever '92 and its associated transfer member 82. The spring 97 tends.

to contract and to force the Y-lever 92 and the member 82 into a dead center relation on the vertical center line between shafts 85 and 96. However, the right-hand edges of members 3| to 85 (exemplified by member 82 in Fig. 1) adjacent the arms 89 rest against the support M. These members 8! to 85 operate in comb slots in the support T4. Therefore, the spring 9'! is normally extended a predetermined extent, and in its effort to contract, it urges member 82 in a clockwise direction against the support 14. Then, when member 82 is actuated in a counterclockwise direction (as viewed in Fig. 1) as will hereinafter appear, the spring 91 will be further stretched or extended while causing the Y-lever 82 to rotate clockwise about shaft 96 with the lower end of stem 90 fulcruming about the upper inner edge of arm 88. Thus, the member 82 and its associated Y-lever 92 approach but do not attain a dead center relationship, thereby assuring normal contactual relationship between stem 90 and arm 88, as well as abutting relationship between member 82 and the stop I4.

The vertically directed arms or bifurcations of the Y-levers 9| to 95 terminate in inwardly directed confronting portions 99 and I00. For example, between the confronting portions 99 and I of lever 92, a slide element IOI is operable. Slide I0| is one of a group of push-pull elements or slides IOI to I05, inclusive, corresponding to the group of Y-levers 9| to 95, inclusive. Each of the slides I0| to I05 is provided with a pair of oppositely disposed offsets or shoulders I06 and IN which cooperate with a pair of blades l 08 and I09, respectively, of a scissors type operating mechanism, indicated generally by the numeric III. The blades I08 and I09 are carried pivotally on a stud shaft H2 appropriately mounted in the framework (not shown) of the apparatus.

Slidably articulated to the stud shaft I2 and disposed midway between the blades I08 and I09 is a bar II3 which is pivotally connected at its lower end to an arm 4 pinned to a rock shaft H5. The depending arms H6 and III, respectively of blades I08 and I09 are connected to" the bar 3 by links 8 and H9, respectively, which in turn are pivotally connected to the bar I I3 by a pivot stud |2| common to both links H8 and M9 to thus form a toggle mechanism. The rock shaft II5 oscillates continuously, thereby causing, through bar H3 and toggle links H8 and H9, the blades I08 and I09 to operate in scissorlike fashion.

In the operation of the selector according to the present invention, the signal impulses are received over line wire 41 to operate the magnet II accordingly. Since the normal stop condition of the line is marking (or current on the line) the magnet II is energized to hold its armature I2 in the solid line position shown in Fig. 3. In this condition the shoulder 2| of sensor I6 rests against the edge of the armature I2, and through projection 48, the stop bail 5| is effective to hold the disc 31, and hence the cam sleeve 26 against rotation, in well known manner in start-stop operation. In response to this stop condition the sensor I5 is also held away from the edge of armature I2 by its cam II thus permitting vibration of armature I2.

In response to a start condition of the line 41 (no current or spacing) the magnet II will become de-energized and its armature I2 will ride off the shoulder 2 I, thus permitting the sensor I6 to respond to the pull of its spring 24 (since its follower 59 is opposite a notch in cam I8). Since, in this condition, the cam follower portion of arm 49 is opposite notch 51 of cam 28, the bail 5| is permitted to respond to the pull of spring I22 to disengage extremity 54 from the stop lug 55 to release the disc 31 (and hence sleeve 26) for rotation to initiate start-stop operation.

In accordance with the present invention, only the sensors I5 and I6 cooperate with the armature I2, and none of the follower elements 4| to cooperate directly with the armature I2. Instead, the follower elements cooperate with the arms 64 carried by the sensor I5. The cams 3| to 35 are of similar cam contour but are displaced on the shaft 21 angularly so that the cam notches I33 are disposed in a helically arranged series whereby coaction with the cam follower portions 68 will occur in a sequential manner as the series of cams 3| to 35 rotates in synchronism with the speed of code impulsing. Thus, the cams 3| to 35 will sequentially allow the follower elements 4| to 45 to respond to the pull of their respective springs unless said elements are blocked through the coaction of the sensors and the armature I2.

The timing of the various cams is disclosed in Fig. 4. Line I23 represents the timing for the sensor control cam II, while line I24 represents the timing for the sensor control and selector'bail cam I8. It is noted that the contours of cams II and I8, as represented by lines I23 and I24, merge, and the apices 62 and the depressions 63 coincide, as also indicated in Fig. 3. It is also observed that the dotted line I24 (Fig. 4) is indicative of the cam notch 6| (Fig. 3). Lines I25 to I29 inclusive, represent the contours of the selector cams 3| to 35.

In the start or rest position of the cam assembly, exemplified by cam sleeve 26, the cam follower portions 68 of all of the selector levers 3| to 35 ride on the high portion or dwell of their associated cams. Soon after the signal cycle is initiated, the cam followers 68 simultaneously ride down their respective inclines |3| to the lower dwell portion I32 of the cams 3| to 35. Then, in timed relation with the receipt of the code impulses, the cam followers 68 will fall sequentially into the respective cam notches I33. For example, when the cam follower 68 of the first selector lever 3| falls into its associated notch I33, the lever 3| will rotate clockwise in response to the pull of its spring 61 to permit the end of the associated interponent or selectable element I2 to fall from shoulder I34 (where it normally rests) to the shoulder or step I3. Then, when the cam follower portion 68 cooperates with the incline I35 of the cam, the selector lever 3| is actuated counterclockwise, and since the interponent I2 is now engaging the step I3, the interponent I2 will be actuated leftwardly. Thus, operation of interponents I2 takes place pursuant to each received impulse, if the impulse is of marking nature, because in response to a markillg impulse the magnet I will be held energized and the sensing lever or sensor I5 will be unblocked. In this condition, the lever I5 is per- .mitted to follow the indent 63 of its cam II,

whereupon the lever I5 will move clockwise (Fig. 3) and arms 64 carried thereon will move right- Wardly to permit the follower element 3| to move correspondingly.

If the signal impulse is of spacing nature, the armature I 2 will be released (to assume its dotted line position in Fig. 3) and therefore will block the clockwise movement of the follower element 3|, thereby preventing the interponent I2 from engaging shoulder I3, and thus the interponent I2 will remain unactuated. As indicated in the diagram shown in Fig. 4, the interponents I2, if actuated, will remain in their leftward or actuated position throughout the code cycle, since the cam follower portions 68 will ride on the dwell I 36.

Line I31 represents the interponent reset cam 38. As seen in Fig. 1, the cam 36 has associated therewith a bail member I38 mounted pivotally on a shaft I39. The bail member I38 comprises a cam follower portion I4| and a bail portion I42. As shown in Fig. 4, the cam 36 is provided with a projection I43 so located in relation to the selector cams 3| to 35 that the cam 36 is operative to lift the selected interponents 12 out of engagement with the shoulder 13 at substantially the same time that the cam follower portions 08 ride down the inclines I3l. At the close of the selecting cycle (one revolution of sleeve 26) the selected interponents rest upon the shoulder or step 13, and so remain until immediatel following the initiation of the neXt cycle, when the projection I43 acts to lift the interponents 12 out of engagement with shoulders 13, and substantially simultaneously the followers 68 of follower elements 4| to 45 ride down the cam slopes |3I and rest on the dwell I32 to maintain the interponents 12 upon surface I34 in readiness for the succeeding selective operation under the control of selector cams 3| to 35.

In said succeeding cycle, if the first code impulse is of marking nature, then the lever I5 will move clockwise, and accordingly the follower element 4| will follow the rod 64 (being permitted to do so by the depression I33 of cam 3|) so that the end of interponent 12 will fall upon the step 13. Then, when the rise I35 of cam 3| acts upon follower 4| to actuate said follower 4| counterclockwise, the interponent 12 associated therewith will be actuated leftwardly (Fig. 1) where it (and the companion interponents that have been selected) will be held until the initial portion of the next cycle, when they will be stripped or reset by the reset bail I42.

An interponent 12 when actuated to its leftward position, will cooperate with arm 89 of transfer member 82 to move the transfer lever 82 to its counterclockwise position. Y-lever 92 will thus be swung, through the instrumentality of spring 91, to its clockwise position. The elements 99 and I of the operated Y-lever 92 will function to move bar I04 to bring the shoulder I01 in the path of the scissor bar I09, whereby the bar I04 will be moved leftwardly (as viewed in Fig. 1) pursuant to the oscillatory movement of the bar I09.

On the other hand, in response to a code signaling impulse of spacing nature, the interponent 12 will remain in its rightward position, and the transfer member 82 will remain against the stop 14. In this condition of operation the Y-lever 92 will assume its counterclockwise position so that, through its extremities 99 and I00, the bar I04 will be swung to its clockwise position to bring the shoulder I00 into the operating path of the scissor blade I08 whereupon the bar I04 will be actuated rightwardly.

Bars. |0| to I are pivotally articulated to a corresponding series of permutation code bars I44 by means of disc and notch connections I45. The permutation code bars I44 are adapted to be detented by spring loaded detent means I46. Code bars I44 are analogous to code bars 62 to 66 disclosed in copending application Serial No. 22,653 filed April 22, 1948, by W. J. Zenner, which eventuated into U. S. Patent No. 2,505,729, dated April 25, 1950.

In Fig. 2 is shown a Y-lever I41, herein identified as the common Y-lever, since it is common to and responds to the operation of Y-levers 9| and 92. Y-lever I41 is provided with a laterally directed flange I48 adapted to span the Y-levers 9| and 92. A spring I49 connected to the Y-lever I41 normally biases the Y-lever I41 counterclockwise (as viewed in Fig. 2) to permit the flange I48 normally to bear against the Y-levers 9| and 92 common thereto. With this arrangement the common Y-lever I 41 will be actuated clockwise whenever either one or both of the Y-levers 9| and 92 are actuated in response to signal impulses. Thus, when either Y-lever 9| or 92 are separately operated, or both are operated substantially simultaneously, the Y-lever I41 is also operated, whereupon the bar I5 I, similar to bars I02 and/or I04 will be actuated to present the shoulder I01 thereof into the path of scissor blade I09 to be actuated thereby. The function of the common Y-lever I41 is analogous to the common bar 61 disclosed in the aforementioned copending application.

Although only one embodiment of the invention has been disclosed hereinbefore, it will be understod that the invention is subject to many other modifications and adaptations, not disclosed herein, without departing from the scope thereof which is to be limited only by the appended claims.

What is claimed is:

1. In a telegraph apparatus, mechanism comprising cyclically operable cam means to control selective operations, signal responsive means including an armature for controlling said mechanism, a pair of armature sensing means included in said mechanism and controlled by said cam means, a plurality of selectors included in said mechanism, means carried by one of said armature sensing means and adapted to span said selectors to govern said selectors, and means controlled by the other of said armature sensing means to control the cyclic operation of said mechanism.

2. In a telegraph apparatus, mechanism comprising cyclically operable cam means to control selective operations, signal responsive means including an armature for controlling said mechanism, a pair of means included in said mechanism controlled by said cam means for sensing said armature, a plurality of selectors included in said mechanism, means carried by one of said armature sensing means and adapted to span said selectors for governing the response of said selectors to the movements of said one of said armature sensing means under the joint control of said cam means and said signal responsive means, and means controlled by the other of said armature sensing means to control the cyclic operation of said mechanism.

3. In a telegraph apparatus, cyclically operable cam means, instrumentalities associated with said cam means to control selective operations, signal responsive means including an armature, a pair of armature locking means controlled by said cam means for sensing said armature, means associated with certain of said armature locking means and adapted to span said instrumentalities to determine the eifectiveness of said instrumentalities, and means controlled by other of said armature locking means to control the cyclic operation of said cam means.

4. In a telegraph apparatus, cyclically operable cam means, instrumentalities associated with said cam means to control selective operations, signal responsive means including an armature, plural means controlled by said cam means for sensing said armature, means associated with certain of said plural means to determine the effectiveness of said instrumentalities, means controlled by other of said plural means in response to a received signal to start said cam means into operation, and means for rendering said start means non-responsive to a pre-determined number of subsequent signals.

5. In a telegraph apparatus, cyclic-ally operable cam: means, selectable elements associated with said cam means to control selective operations, signal responsive means including an armature, a pair of armature locking means controlled by said cam means for sensing said armature, means carried by one of said armature locking means to determine the effectiveness of said selectable elements, a plurality of actuators operably associated with said selectable elements, an instrumentality operably associated with each,actuator, a member yieldably associated with each instrumentality, an element cooperably related to each member, a permutation bar associated with each element, operating means cooperable with said last recited elements as determined by said members according to the selective operation to selectively operate said permutation bar, and means controlled by the other of said armature locking means to control the cyclical operation of said cam means.

6. In a printing telegraph selector, a signal responsive means, a plurality of cams, a follower associated with each cam and urged to engage the surface thereof, said cams having low portions into which the followers are urged followed by raised portions for actuating the followers invariably, an actuator associated with each follower, an instrumentality associated with each actuator, a member yield-ably associated with each instrumentality, an element cooperably related to each member, each of said elements having on opposite edges thereof oppositely disposed shoulder portions, a permutation bar associated with each element, and operating means cooper-able with said shoulder portions as determined by said members according to the selective operation of said signal responsive means to selectively operate said permutation bar.

7. In a printing telegraph selector, a signal responsive means, a plurality of cams, a follower associated with each cam and urged to engage the surface thereof, said cams having low portions into which the followers are urged followed by raised portions for actuating the followers invariably, a slid-able actuator associated with each follower, an instrumentality associated with each slidable actuator, a member yieldably associated with each instrumentality, an element cooperably related to said member, each of said elements having on opposite edges thereof oppositely disposed shoulder portions, a permutation bar associated with each element, and toggle operated mean cooperable with said shoulder portions as determined by said members according to the selective operation of said signal responsive means to selectively operate said permutation bar.

8. In a printing telegraph selector, a signal responsive means, a plurality of cams, a follower associated with each cam and urged to engage the surface thereof, said cams having low portions into which the followers are urged followed by raised portions for actuating the followers invariably,- a slidable actuator associated With each follower, an instrumentality associated with each slidable actuator, a stop, a member yieldably associated with each instrumentality by a single spring eXtended therebetween, said spring tending to maintain said instrumentality in a. normal position against said stop, an element cooperably related; to .each' member, .a permutationxbar associated ,witheach element, and operating means copperablei'with said element in'one'mannenwhen yro said instrumentality is in a normal position and in another manner when said instrumentality is operated to its off-normal position under control of said signal responsive means to correspondingly operate said permutation bars.

9. In a telegraph apparatus, mechanism controlled by received signals comprising cyclically operable cam means to control selective operations, signal responsive means including an armature, followers associated with said cam means and urged to engage the cam surfaces thereof, said cams having low portions into which the followers are urged followed by raised portions for actuating the followers invariably, a member associated with each follower for actuation thereby, a pair of armature locking levers included in said mechanism controlled by said cam means in synchronism with said received signals, and a pair of oppositely extending arms secured to one of said armature locking levers and adapted to cooperate with said followers, whereby the actuation of said followers toward said cams is controlled.

10. In a telegraph apparatus, mechanism comprising cyclically operable cam means to control selective operations, elements associated with said cam means and urged to engage the cam surfaces thereof, said cams having low portions into which said elements are urged followed by raised portions for actuating said elements, a member associated with each element for actuation thereby, signal responsive means including an armature for controlling said mechanism, a pair of armature locking means including in said mechanism controlled by said cam means, and control means associated with one of said armature locking means adapted to cooperate with said elements, whereby the actuation of said elements toward said cams is controlled by said control means.

11. In a telegraph apparatus, mechanism comprising cyclically operable cam means to control selective operations, signal responsive means including an armature for controlling said mech anism, a pair of armature locking means included in said mechanism controlled by said cam means, means associated with certain of said armature locking means to effectuate said selective operations, and means controlled by other of said armature locking means to control the cyclic operation of said mechanism.

12. In a telegraph apparatus, mechanism com prising cyclically operable cam means to control selective operations, signal responsive means including an armature for controlling said mechanism, a pair of armature locking means included in said mechanism controlled by said cam means, means associated with certain of said armature locking means to effectuate said selective operations, means controlled by other of said armature locking means operable in response to a received signal to start said cam means into operation, and means for rendering said start means non-responsive to a predetermined number of subsequent signals.

13. In a telegraph apparatus, mechanism comprising cyclically operable cam means to control selective operations, followers associated with said cam means and urged to engage, the cam surfaces thereof, said cams having low portions into which the followers are urged followed by raised portions for actuating the followers, a sli'dable actuator associated with each follower including an armature for controlling said mechanism, armature locking means included in said mechanism controlled by said cam means. means associated with certain of said armature locking means adapted to cooperate with said followers, whereby the actuation of said followers toward said cams is controlled, and means controlled by other of said armature locking means to control the cyclic operation of said mechanism.

14. In a telegraph apparatus, mechanism-comprising cyclically operable cam means to control selective operations, followers associated with said cam means and urged to engage the cam surfaces thereof, said cams having low portions into which the followers are urged followed by raised portions for actuating the followers, a slidable actuator associated with each follower for actuation thereby, signal responsive means including an armature for controlling said mechanism, armature locking means included in said mechanism controlled by said cam means, means associated with certain of said armature locking means adapted to cooperate with said followers, whereby the actuation of said followers toward said cams is controlled, means controlled by other of said armature locking means operable in response to a received signal to start said cam means, and means for rendering said start means non-responsive to a predetermined number of subsequent signals.

15. In a telegraph apparatus, mechanism controlled by received signals comprising cyclically operable cam means to control selective operations, a plurality of slidableactuators associated with said cam means, a pivoted instrumentality associated with eachslidable actuator, a pivoted Y-lever yieldably associated with each instrumentality, a push-pull element operably disposed between the bifurcations of each Y-lever, each of said elements provided on opposite edges'thereof with oppositely directed offsets, a permutation bar associated with each element, and a scissorstype operator cooperable with said offsets as determined by said Y-levers according to the selective operation of said mechanism to selectively operate said permutation bars.

16. In a telegraph apparatus, mechanism controlled by received signals comprising cyclically operable cam means to control selective operations, a plurality of slidable actuators associated with said cam means, an instrumentality associated with each slidable actuator, a bifurcated member yieldably associated with each instrumentality, an element operably disposed between the bifurcations of each member, a permutation bar associated with each element, and operating means cooperable with said elements as determined by said bifurcated members according to the selective operation to selectivelyoperate said permutation bar.

17. In a telegraph apparatus, mechanism'controlled by received signals comprising cyclically operable cam means to control selective operations, a plurality of slidable actuators associated with said cam means, an instrumentality associated with each slidable actuator, a bifurcated member yieldably associated with each instrumentality, a shouldered element cooperably disposed between the bifurcations of each member, a permutation bar associated with each element, and operating means cooperable with the shoulders of said elements. as determined by said bifurcated, members according "to: the; selective, operatiorr to seleetivelyoperate; said. permutation bar.

18. In a printing telegraph. selector, a. plurality of cams, a follower associated with each, cam and urged. to engage the surface. thereof, said cams having low portions into which the followers are urged'followed by raised portions for actuating the followers invariably, a slidable actuator associated with each follower for actuation thereby, a signal responsive means including an armature and a pair of locking levers having oppositely disposed stepped extremities cooperable with the extremity of said armature, said armature adapted to cooperate solely with said locking levers, and a pair of oppositely extending arms secured to one of said locking levers and adapted to cooperate with said followers whereby the actuation of said followers toward said cam is controlled.

19. In a printing telegraph selector, the combination of a. plurality of cams, a followerassociated with each cam and urged to engage the surface thereof, said cams having low portions into which the followers are urged followed by raised portions for actuating the followers invariably, a slidable actuator associated with each follower, and a signal responsive means including an armature and a pair of locking levers, characterized in this that said armature cooperates solely with the pair of locking levers, and one of said locking levers is provided with means adapted to cooperate with said followers to control the actuation of said followers toward said cams.

20. In a printing telegraph selector, the combination of a plurality of cams, a follower associated with each cam and urged to engage the surface thereof, said cams having low portions into which the followers are urged followed by raised portions for actuating the followers invariably, a slidable actuator associated with each follower, and a signal responsive means including an armature, characterized in this that a pair of locking levers having shouldered extremities cooperates with the extremity of the armature, said armature adapted to cooperate solely with said locking'levers, and a pair of oppositely extending arms secured to one of said locking levers and adapted to cooperate with said followers to control the actuation of said followers toward said cams.

21. In a printing telegraph selector, a signal responsive means including a plurality of cams, a follower associated with each cam and urged to engage the surface thereof, said cams having low portions into which the followers are urged followed by raised portions for actuating the followers invariably, a slidable actuator associated with each follower, a pivoted instrumentality associated with each slid'able actuator, a pivoted Y-lever yieldably associated with each instrumentality, a push-pull element operably disposed between the bifurcations of. each Y-lever. each of said elements provided on opposite edges thereof with oppositely directed offsets, and a permutation bar associated with each element, and a scissors-type operator cooperablewith said offsets, as determined by said Y-levers according to the selective operation of said signal responsive means to selectively operate said permutation bars.

22. In a printing telegraph selector, a signal responsive means, a plurality of cams, a follower associated with each cam and urged to engage the-surface thereof, said cams having: low portionsjntowhich the followers areurged followed -by'raisedzportions for actuating the' followers invariably, a slidable actuator associated with each follower, a pivoted instrumentality associated with each slidable actuator, a pivoted Y-lever yieldably associated with each instrumentality, a push-pull element operably disposed between the bifurcations of each Y-lever, a permutation bar associated with each element, and operating means cooperable with said elements as determined by said Y-levers according to the selective operation of said signal responsive means to selectively operate said permutation bars.

23. In a printing telegraph selector, a plurality of cams, a follower associated with each cam and urged to engage the surface thereof, said cams having low portions into which the followers are urged followed by raised portions for actuating the followers invariably, a slidable actuator associated with each follower for actuation thereby, a signal responsive means including an armature and a -pair of locking levers having oppositely disposed stepped extremities cooperable with the extremity of said armature, said armature adapted to cooperate solely with said locking levers, a pair of oppositely extending arms secured to one of said locking levers and adapted to cooperate with said followers to control the actuation of said followers toward said earns, a pivoted instrumentality associated with each slidable actuator, a pivoted Y-lever yieldably associated with each instrumentality, a push-pull element operably disposed between the bifurcations of each Y-lever, each of said elements provided on opposite edges thereof with oppositely directed offsets, a permutation bar associated with each element, and a scissors-type operator cooperable with said offsets as determined by said Y-levers according to the selective operation of said signal responsive means to selectively operate said permutation bars.

24. In a printing telegraph selector, a signal responsive means, a plurality of cams, a follower associated with each cam and urged to engage the surface thereof, said cams having low portions into which the followers are urged followed by raised portions for actuating the followers invariably, a slidable actuator associated with each follower, a pivoted instrumentality associated with each slidable actuator, a pivoted Y- lever yieldably associated with each instrumentality, an element operably disposed between the bifurcations of each Y-lever, a permutation bar associated with each element, and operating means cooperable with said elements as determined by said Y-levers according to the selective operation of said signal responsive means to selectively operate said permutation bars.

25. In a printing telegraph selector, a signal responsive means, a plurality of cams, a follower associated with each cam and urged to engage the surface thereof, said cams having low portions into which the followers are urged followed by raised portions for actuating the followers invariably, a slidable actuator associated with each follower, an instrumentality associated with each slidable actuator, a bifurcated member yieldably associated with each instrumentality, an element operably disposed between the bifurcations of each member, a permutation bar associated with each element, and operating means cooperable with said elements as determined by said bifurcated members according to the selective operation of said signal responsive means to selectively operate said p-remutation bar.

26. In a telegraph apparatus, mechanism controlled by received signals comprising cyclically operable cam means to control selective operations, signal responsive means including an armature, elements associated with said cam means and urged to engage the cam surfaces thereof, said cams having low portions into which the elements are urged followed by raised portions for positively actuating the elements invariably, a member associated with each element for positive actuation thereby, a pair of means controlled by said cam means for sensing said armature, means carried by one of said armature sensing means and adapted to span said elements, whereby the actuation of said elements toward said cams is controlled, and means controlled by the other of said pair of means to control the cyclical operation of said cam means.

27. In a telegraph apparatus, mechanism controlled by received signals comprising cyclically operable cam means to control selective operations, signal responsive means including an armature, followers associated with said cam means and urged to engage the cam surfaces thereof, said cams having low portions into which the followers are urged followed by raise ortions for actuating the followers invariably, a member associated with each follower for actuation thereby, a pair of armature locking levers included in said mechanism controlled by said cam means in synchronism with said received signals, and laterally directed means secured to one of said armature locking levers and adapted to cooperate with said followers, whereby the actuation of said followers toward said cams is controlled.

WALTER J. ZENNER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,783,382 Krum Dec. 2, 1930 1,821,110 Morton et al Sept. 1, 1931 1,917,308 Krum July 11, 1933 1,932,932 Griflith Oct. 31, 1933 1,937,376 Zenner Nov. 28, 1933 FOREIGN PATENTS Number Country Date 501,702 Great Britain Mar. 3, 1939 694,414 Germany July 31, 1940 

